Originally Posted by odpurple
Your axle in black is a Trinity. They have the counterweighted clamping hub. Niftech axles and hubs only come in polished aluminum.
If you've never had Niftech diff, you are missing the Ferrari of 1/12th diffs.
All the axles I use (Niftech or IRS) use two 1/4x3/8 flanged bearings on the axle, two of the same on the in and outside of the right hub and one 1/4x3/8 unflanged on the spur. I don't think it matters if you use an unflanged bearing on the inside of the right hub though.
Trinity, didn't think of that, probably from a switch blade. I took apart the rear and the bearings are as you said, but the the flanged bearing was on the spur, it appears that either will work there, same as the inside the hub. I switched those two and put the unflanged on the spur. Chech out Avidrc.com for bearings, you can't beat that deal with a stick. Very high quality bearings, been using there bearings in my 1/8 clutch bells for years.